import 'dart:io';
import 'package:win_text_editor/app/models/file_node.dart';

class FileService {
  /// 延时加载目录内容（不递归）
  static Future<List<FileNode>> listDirectory(String path, {int parentDepth = 0}) async {
    final directory = Directory(path);
    final List<FileNode> nodes = [];

    if (await directory.exists()) {
      final entities = directory.listSync();
      for (final entity in entities) {
        nodes.add(
          FileNode(
            name: entity.path.split(Platform.pathSeparator).last,
            path: entity.path,
            isDirectory: entity is Directory,
            depth: parentDepth + 1, // 关键修复：基于父节点深度+1
            children: [],
          ),
        );
      }
    }
    return nodes;
  }

  /// 递归构建完整文件树（原方法保留备用）
  static Future<List<FileNode>> buildFileTree(String rootPath) async {
    final rootDirectory = Directory(rootPath);
    final List<FileNode> nodes = [];

    if (await rootDirectory.exists()) {
      final entities = rootDirectory.listSync();

      for (final entity in entities) {
        final node = FileNode(
          name: entity.path.split(Platform.pathSeparator).last,
          path: entity.path,
          isDirectory: entity is Directory,
        );

        if (entity is Directory) {
          node.children.addAll(await buildFileTree(entity.path));
        }

        nodes.add(node);
      }
    }

    return nodes;
  }

  static Future<String> readFile(String filePath) async {
    return await File(filePath).readAsString();
  }

  static Future<void> writeFile(String filePath, String content) async {
    await File(filePath).writeAsString(content);
  }
}